Cord of Wood Calculator
Accurately measure your firewood stack and avoid getting shorted.
Calculate Your Firewood Volume
Formula: (L × H × W) ÷ 128 = Cords
Visualizing Your Wood Pile
Dynamic chart comparing your stack volume to a standard Full Cord and Face Cord.
| Measurement Unit | Common Dimensions (L × H × W) | Cubic Feet | Description |
|---|---|---|---|
| Full Cord | 8 ft × 4 ft × 4 ft | 128 cu. ft. | The legal standard unit for firewood sales in most areas. |
| Face Cord (Rick) | 8 ft × 4 ft × 1.33 ft (16″) | ~42.6 cu. ft. | One-third of a full cord, based on 16-inch wood length. |
| Half Cord | 8 ft × 4 ft × 2 ft | 64 cu. ft. | Exactly half the volume of a full cord. |
A reference table for common firewood measurements.
What is a Cord of Wood?
A cord of wood is the official, legally defined unit of measurement for firewood in the United States and Canada. When properly stacked, a full cord occupies a volume of 128 cubic feet. The standard dimensions are typically visualized as a stack 8 feet long, 4 feet high, and 4 feet deep. Understanding how to calculate cord of wood volume is essential for anyone buying or selling firewood to ensure a fair transaction. The term “cord” likely originated from the use of a cord or string to measure the circumference of a woodpile.
Anyone who uses a wood-burning stove, fireplace, or outdoor fire pit should be familiar with this measurement. A common misconception is confusing a “full cord” with a “face cord” or “rick.” A face cord has the same height and length as a full cord (4×8 feet) but is only as deep as the length of a single log, often 16 inches. This means a face cord is only about one-third of a full cord. Using a reliable cord of wood calculator is the best way to verify your volume.
Cord of Wood Formula and Mathematical Explanation
The mathematics to calculate cord of wood volume are straightforward. It’s a simple volume calculation based on the dimensions of your wood stack. The key is to remember the standard volume of a full cord, which is 128 cubic feet.
The formula is:
Cords = (Stack Length [ft] × Stack Height [ft] × Stack Width [ft]) / 128
To use this formula, you measure the three dimensions of your neatly stacked pile of wood in feet. Multiply them together to get the total cubic footage, and then divide that number by 128 to find the number of cords. Our cord of wood calculator automates this process for you.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Stack Length | The longest horizontal dimension of the woodpile. | Feet (ft) | 4 – 24 ft |
| Stack Height | The vertical height of the woodpile. | Feet (ft) | 2 – 6 ft |
| Stack Width | The depth of the stack, equal to the average log length. | Feet (ft) | 1.33 ft (16″) – 4 ft |
| 128 | The constant representing the cubic feet in one full cord. | Cubic Feet | 128 |
Practical Examples (Real-World Use Cases)
Example 1: Buying a “Full Cord”
A seller delivers a stack of wood that they claim is a full cord. You stack it neatly and measure it. The pile is 10 feet long, 4 feet high, and the logs are cut to an average of 20 inches (which is 1.67 feet).
- Inputs: Length = 10 ft, Height = 4 ft, Width = 1.67 ft
- Calculation: (10 × 4 × 1.67) / 128 = 66.8 / 128 = 0.52 cords
Interpretation: The delivery was significantly short of a full cord; it’s just over half a cord. Using a cord of wood calculator before paying can prevent this situation.
Example 2: Stacking Wood in a Rack
You have a firewood rack that is 8 feet long and designed to be stacked 4 feet high. You fill it with standard 16-inch firewood (1.33 feet).
- Inputs: Length = 8 ft, Height = 4 ft, Width = 1.33 ft
- Calculation: (8 × 4 × 1.33) / 128 = 42.56 / 128 = 0.33 cords
Interpretation: Your full rack holds exactly one-third of a cord, which is also known as a face cord. This is a very common amount for casual firewood users to purchase. To calculate cord of wood volume accurately, always measure the final, stacked dimensions.
How to Use This Cord of Wood Calculator
Our tool is designed for ease of use and accuracy. Follow these simple steps to calculate cord of wood volume for your stack:
- Measure Your Stack: Using a tape measure, find the average length, height, and width of your firewood pile in feet. For width, use the average length of the individual pieces of wood.
- Enter Dimensions: Input your three measurements into the corresponding fields in the calculator above.
- (Optional) Add Price: If you know the price per full cord, enter it to calculate the total value of your stack.
- Review Real-Time Results: The calculator instantly updates the total cords, total cubic feet, and other key metrics.
- Analyze Visuals: The dynamic chart and reference table help you visualize your volume compared to standard firewood measurements.
The primary result tells you exactly how many cords you have. This is crucial for verifying purchases or determining if you have enough wood for the winter. This process is essential for anyone wanting to correctly calculate cord of wood volume.
Key Factors That Affect Cord of Wood Results
Several factors can influence the final volume when you calculate cord of wood. Acknowledging these can help you stack more efficiently and get more value.
Stacking Tightness
A loosely stacked pile with large air gaps will occupy more space but contain less wood. For an accurate measurement, wood should be stacked as tightly and parallel as possible.
Wood Shape and Size
Straight, split logs will stack more compactly than crooked, round logs. The more uniform the pieces, the less air space and the more accurate your cord of wood calculator result will be.
Log Length Consistency
Using the average log length for the ‘width’ measurement is key. If your log lengths vary wildly, your calculation will be less precise. Try to sort logs by length for more consistent stacks.
Stack Settling
Over time, a woodpile will settle as the wood dries, shifts, and compresses. A freshly stacked pile may measure slightly larger than one that has been sitting for months.
Ground Level
Stacking on uneven ground can make it difficult to get accurate height and length measurements. It’s best to measure from the average base to the average top of the pile.
Moisture Content
While moisture doesn’t change the physical volume for the calculation, it’s a huge factor in value. Green wood is heavy and has less energy output. Always aim to buy or burn seasoned wood. Learn more with our firewood BTU calculator.
Frequently Asked Questions (FAQ)
What’s the difference between a full cord and a face cord?
A full cord has a volume of 128 cubic feet (e.g., 4’x4’x8′). A face cord has the same face dimensions (4’x8′) but is only as deep as the log length, typically 16 inches, making it about 1/3 of a full cord. It is important to clarify which unit is being sold.
How do I measure a messy, unstacked pile of wood?
It’s nearly impossible to accurately calculate cord of wood from a loose pile. The only reliable way is to stack it neatly first. Some estimate by assuming a loose pile takes up ~180 cubic feet per cord, but this is not a legal or accurate measure.
Is a ‘rick’ of wood the same as a face cord?
Yes, the terms ‘rick,’ ‘face cord,’ and sometimes ‘stove cord’ are often used interchangeably to refer to a stack of wood that is 4 feet high, 8 feet long, and as deep as the wood length (often 16″ or 24″). The term is not legally defined, so always ask for dimensions.
How many logs are in a cord of wood?
This varies greatly based on the size of the logs. A cord could contain anywhere from 400 large, split logs to over 1000 smaller logs. Volume, not piece count, is the correct way to measure a cord.
Why is it 128 cubic feet?
The standard of 128 cubic feet (4’x4’x8′) was established centuries ago as a consistent, verifiable unit for the trade of firewood, ensuring both buyer and seller have a common measure. This standard helps regulate the industry.
What is the best way to stack wood for measurement?
For an accurate cord of wood calculator result, stack logs in parallel rows, as tightly as possible without interlocking. Keep the ends relatively flush and the height as even as possible. See our guide on wood stacking tips for more information.
Does the type of wood matter when I calculate a cord?
No, a cord is a measure of volume, so the type of wood (e.g., oak vs. pine) does not change the result of the volume calculation. However, wood density varies greatly, meaning a cord of dense hardwood like oak will weigh much more and produce more heat (BTUs) than a cord of softwood like pine.
Can I sell wood without measuring it in cords?
In many states and provinces, it is illegal to sell firewood by any measure other than a cord or a fraction of a cord. Selling by “truckload” or “pile” is often prohibited to protect consumers. Always check your local regulations.